摘要
本文利用大气折射积分母函数方法，分别给出在射电波段和光学波段上天文大气折射改正的映射函数，并完整地考虑了天文学和空间技术所需要的物理和地球物理因素引入的改正．本文还利用探空气球的资料分析了新天文大气折射改正公式的实际精度；计算结果证明：它在2°高度角时达到5”左右，而在5°高度角时约为1”．我们认为：限制计算精度的主要因素是真实地球大气分布与理论大气模型的区别．
On the basis of the generator function the method of calculating atmospheric reflaction integrals and their mathematical expansions were discussed in references [6-8].In this paper we propose the complete astronomical refraction formula useful for space teclmology and astronomy. The meteorologically and geophysically parameterized mapping functions of refrative delays and astronomical refraction were derived in [7,8]for the standard atmospheric model which can be adopted for space and ground facilities. Another main topic of mis paper is devoted to show the actual accuracy of the new astronomical refraction formula with radiosonic data, in which the coefficients of the new continued fraction mapping function have been adjusted by the numerical integrals along the paths of signals. The introduction of the mapping function of astronomical refraction may greatly improve the accuracy of computation in comparison with the conventional series expansion method. In comparison with radiosonic data,the accuracy of our formula is about 1' at elevation 5' and about 5' at 2°. Some correchons, related to the frequency of signal and the geographic location of station,are also briefly reviewed in mis paper. This may give reasonable contribution to calculation of astronomical refraction in observations at low elevations.
出处
《天文学报》
CSCD
北大核心
1998年第2期113-121,共9页
Acta Astronomica Sinica
